https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-08#section-4.1.1

In JSEP, it says we need a "bundle policy".  See for example:
https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-08#section-4.1.1.  But we're
lacking the WebIDL in the W3C spec.

Something like:

enum RTCBundlePolicy {
  "balanced",
  "max-compat",
  "max-bundle",
};

dictionary RTCConfiguration {
  // ... iceServers, etc
  DOMString bundlePolicy = "balanced"; // see RTCBundlePolicy
};